diff --git a/www/artworks/get.php b/www/artworks/get.php
index 73f90e8e..e2b5ffea 100644
--- a/www/artworks/get.php
+++ b/www/artworks/get.php
@@ -176,7 +176,7 @@ catch(Exceptions\InvalidPermissionsException){
 					<label>
 						<span>In use by</span>
 						<span>The full S.E. ebook URL. If not in use, leave this blank.</span>
-						<input type="url" name="artwork-ebook-url" value="<?= Formatter::EscapeHtml($artwork->EbookUrl) ?>"/>
+						<input type="url" name="artwork-ebook-url" placeholder="https://standardebooks.org/ebooks/" pattern="^https:\/\/standardebooks\.org\/ebooks/[^\/]+(\/[^\/]+)+$" value="<?= Formatter::EscapeHtml($artwork->EbookUrl) ?>"/>
 					</label>
 				<? }else{ ?>
 					<input type="hidden" name="artwork-ebook-url" value="<?= Formatter::EscapeHtml($artwork->EbookUrl) ?>" />